Spitfire provides their famed Formula Four urethane in a softer 90a durometer with the Sapphires skateboard wheels arriving in a neon pink and green colorway and a 54mm diameter. Great for rough terrain or slippery ramps, the semi-translucent Sapphires feature subtle sidewall branding as well as an interior grinning flame logos hidden within the tread for a fun effect while the wheels spin.